This study investigates the trends in urolith composition in cats through the retrospective evaluation of 5,230 uroliths sent to a urinary stone analysis laboratory between 1985 and 2004. The ratio calcium oxalate: struvite increased significantly over those 20 years except for the last 3 years of the study.
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Evaluation of trends in urolith composition in cats: 5,230 cases (1985-2004).
Cannon, A.B. et al.